. >> hey, jonathan. >> reporter: michael only started playing guitar three years ago. he says he began with visions of one day performing in front of large adoring crowds. ♪ sometimes i find i get to the thinking of the past ♪ >> reporter: after his first visit to the hospital, though, michael saw how much more powerful an audience of one can be -- ♪ there is >> reporter: than an audience of 1,000. >> i have a feeling like it's going to sustain them in some way. it's going to help them through what they're going through. ♪ hallelujah hallelujah ♪ >> reporter: peggy walker, chaplin, coordinates the program and sings harmony. >> what happens is magic, transformative. what happens is inexplicable. ♪ hallelujah >> reporter: peggy says in these rooms she's seen not only spirits rise, but vital signs improve. >> if this was a drug, they'd be prescribing this. >> reporter: the goodwill clearly flowing both ways and by the songs are done, patients are not the only ones feeling better. >> you're walking on a cloud after you do that. i mean, it's just incredible, an